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path: root/drivers/phy/mediatek/phy-mtk-ufs.c
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-rw-r--r--drivers/phy/mediatek/phy-mtk-ufs.c199
1 files changed, 199 insertions, 0 deletions
diff --git a/drivers/phy/mediatek/phy-mtk-ufs.c b/drivers/phy/mediatek/phy-mtk-ufs.c
new file mode 100644
index 000000000..fc19e0fa8
--- /dev/null
+++ b/drivers/phy/mediatek/phy-mtk-ufs.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 MediaTek Inc.
+ * Author: Stanley Chu <stanley.chu@mediatek.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#include "phy-mtk-io.h"
+
+/* mphy register and offsets */
+#define MP_GLB_DIG_8C 0x008C
+#define FRC_PLL_ISO_EN BIT(8)
+#define PLL_ISO_EN BIT(9)
+#define FRC_FRC_PWR_ON BIT(10)
+#define PLL_PWR_ON BIT(11)
+
+#define MP_LN_DIG_RX_9C 0xA09C
+#define FSM_DIFZ_FRC BIT(18)
+
+#define MP_LN_DIG_RX_AC 0xA0AC
+#define FRC_RX_SQ_EN BIT(0)
+#define RX_SQ_EN BIT(1)
+
+#define MP_LN_RX_44 0xB044
+#define FRC_CDR_PWR_ON BIT(17)
+#define CDR_PWR_ON BIT(18)
+#define FRC_CDR_ISO_EN BIT(19)
+#define CDR_ISO_EN BIT(20)
+
+#define UFSPHY_CLKS_CNT 2
+
+struct ufs_mtk_phy {
+ struct device *dev;
+ void __iomem *mmio;
+ struct clk_bulk_data clks[UFSPHY_CLKS_CNT];
+};
+
+static struct ufs_mtk_phy *get_ufs_mtk_phy(struct phy *generic_phy)
+{
+ return (struct ufs_mtk_phy *)phy_get_drvdata(generic_phy);
+}
+
+static int ufs_mtk_phy_clk_init(struct ufs_mtk_phy *phy)
+{
+ struct device *dev = phy->dev;
+ struct clk_bulk_data *clks = phy->clks;
+
+ clks[0].id = "unipro";
+ clks[1].id = "mp";
+ return devm_clk_bulk_get(dev, UFSPHY_CLKS_CNT, clks);
+}
+
+static void ufs_mtk_phy_set_active(struct ufs_mtk_phy *phy)
+{
+ void __iomem *mmio = phy->mmio;
+
+ /* release DA_MP_PLL_PWR_ON */
+ mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, PLL_PWR_ON);
+ mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, FRC_FRC_PWR_ON);
+
+ /* release DA_MP_PLL_ISO_EN */
+ mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, PLL_ISO_EN);
+ mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, FRC_PLL_ISO_EN);
+
+ /* release DA_MP_CDR_PWR_ON */
+ mtk_phy_set_bits(mmio + MP_LN_RX_44, CDR_PWR_ON);
+ mtk_phy_clear_bits(mmio + MP_LN_RX_44, FRC_CDR_PWR_ON);
+
+ /* release DA_MP_CDR_ISO_EN */
+ mtk_phy_clear_bits(mmio + MP_LN_RX_44, CDR_ISO_EN);
+ mtk_phy_clear_bits(mmio + MP_LN_RX_44, FRC_CDR_ISO_EN);
+
+ /* release DA_MP_RX0_SQ_EN */
+ mtk_phy_set_bits(mmio + MP_LN_DIG_RX_AC, RX_SQ_EN);
+ mtk_phy_clear_bits(mmio + MP_LN_DIG_RX_AC, FRC_RX_SQ_EN);
+
+ /* delay 1us to wait DIFZ stable */
+ udelay(1);
+
+ /* release DIFZ */
+ mtk_phy_clear_bits(mmio + MP_LN_DIG_RX_9C, FSM_DIFZ_FRC);
+}
+
+static void ufs_mtk_phy_set_deep_hibern(struct ufs_mtk_phy *phy)
+{
+ void __iomem *mmio = phy->mmio;
+
+ /* force DIFZ */
+ mtk_phy_set_bits(mmio + MP_LN_DIG_RX_9C, FSM_DIFZ_FRC);
+
+ /* force DA_MP_RX0_SQ_EN */
+ mtk_phy_set_bits(mmio + MP_LN_DIG_RX_AC, FRC_RX_SQ_EN);
+ mtk_phy_clear_bits(mmio + MP_LN_DIG_RX_AC, RX_SQ_EN);
+
+ /* force DA_MP_CDR_ISO_EN */
+ mtk_phy_set_bits(mmio + MP_LN_RX_44, FRC_CDR_ISO_EN);
+ mtk_phy_set_bits(mmio + MP_LN_RX_44, CDR_ISO_EN);
+
+ /* force DA_MP_CDR_PWR_ON */
+ mtk_phy_set_bits(mmio + MP_LN_RX_44, FRC_CDR_PWR_ON);
+ mtk_phy_clear_bits(mmio + MP_LN_RX_44, CDR_PWR_ON);
+
+ /* force DA_MP_PLL_ISO_EN */
+ mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, FRC_PLL_ISO_EN);
+ mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, PLL_ISO_EN);
+
+ /* force DA_MP_PLL_PWR_ON */
+ mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, FRC_FRC_PWR_ON);
+ mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, PLL_PWR_ON);
+}
+
+static int ufs_mtk_phy_power_on(struct phy *generic_phy)
+{
+ struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy);
+ int ret;
+
+ ret = clk_bulk_prepare_enable(UFSPHY_CLKS_CNT, phy->clks);
+ if (ret)
+ return ret;
+
+ ufs_mtk_phy_set_active(phy);
+
+ return 0;
+}
+
+static int ufs_mtk_phy_power_off(struct phy *generic_phy)
+{
+ struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy);
+
+ ufs_mtk_phy_set_deep_hibern(phy);
+
+ clk_bulk_disable_unprepare(UFSPHY_CLKS_CNT, phy->clks);
+
+ return 0;
+}
+
+static const struct phy_ops ufs_mtk_phy_ops = {
+ .power_on = ufs_mtk_phy_power_on,
+ .power_off = ufs_mtk_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int ufs_mtk_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct phy *generic_phy;
+ struct phy_provider *phy_provider;
+ struct ufs_mtk_phy *phy;
+ int ret;
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->mmio = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(phy->mmio))
+ return PTR_ERR(phy->mmio);
+
+ phy->dev = dev;
+
+ ret = ufs_mtk_phy_clk_init(phy);
+ if (ret)
+ return ret;
+
+ generic_phy = devm_phy_create(dev, NULL, &ufs_mtk_phy_ops);
+ if (IS_ERR(generic_phy))
+ return PTR_ERR(generic_phy);
+
+ phy_set_drvdata(generic_phy, phy);
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id ufs_mtk_phy_of_match[] = {
+ {.compatible = "mediatek,mt8183-ufsphy"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, ufs_mtk_phy_of_match);
+
+static struct platform_driver ufs_mtk_phy_driver = {
+ .probe = ufs_mtk_phy_probe,
+ .driver = {
+ .of_match_table = ufs_mtk_phy_of_match,
+ .name = "ufs_mtk_phy",
+ },
+};
+module_platform_driver(ufs_mtk_phy_driver);
+
+MODULE_DESCRIPTION("Universal Flash Storage (UFS) MediaTek MPHY");
+MODULE_AUTHOR("Stanley Chu <stanley.chu@mediatek.com>");
+MODULE_LICENSE("GPL v2");